Dear Bruce, Following the instructions you gave John Hayes, I tried installing this fix on both a windows XP and Windows 7 machine today. Installing the PCA.pm file in the strawberry\perl\site\lib\Demeter folder seems to result in the crashing Athena when the pca tab is selected. I initially replaced both PCA.pm files and crashed the program then replaced one at a time and it is this file which causes the crash. Looking at github I see it was last changed yesterday I think, so suspect you may have altered it recently in a less than perfect manner. Log file attached. Thanks Fred -- This e-mail and any attachments may contain confidential, copyright and or privileged material, and are for the use of the intended addressee only. If you are not the intended addressee or an authorised recipient of the addressee please notify us of receipt by returning the e-mail and do not use, copy, retain, distribute or disclose the information in or attached to the e-mail. Any opinions expressed within this e-mail are those of the individual and not necessarily of Diamond Light Source Ltd. Diamond Light Source Ltd. cannot guarantee that this e-mail or any attachments are free from viruses and we cannot accept liability for any damage which you may sustain as a result of software viruses which may be transmitted in or with the message. Diamond Light Source Limited (company no. 4375679). Registered in England and Wales with its registered office at Diamond House, Harwell Science and Innovation Campus, Didcot, Oxfordshire, OX11 0DE, United Kingdom